Epidemiology of drug use among adolescents.
D000293:Adolescent; D000294:Adolescent Behavior; D000328:Adult; D000367:Age Factors; D002648:Child; D003625:Data Collection; D006801:Humans; D002189:Marijuana Abuse / Q000453:epidemiology; D009042:Motivation / Q000187:drug effects; D019966:Substance-Related Disorders / Q000453:epidemiology*; D014481:United States